Normally, I'd say its fried, but since its ifixit, if you feel adventurous, you could go in and test all the parts of the motherboard, find out whats burnt out, and replace that bit. Otherwise, its a goner. I recommend putting all network adapters/modems/routers/etc. be connected to a UPS (Even if theres a blackout, the internet lines still work) (Uninterruptible Power Supply, AKA a battery backup). The UPSs I use are from APC.